Improved machine for cutting rasps



D. & i. S. SHATTUCK.

Fiie Cutting Machine.

No. 38,135. f Patented Aprii 7, i863.

UNITED STATES PATENT OFFICE.

DAVID SHATTUCK, OF CAMBRIDGE, AND JOHN S. SHATTUCK, OF MALDEN, MASSACHUSETTS, ASSIGNORS TO THE WHIPPLE FILE MANUFACTURING COMPANY.

Specification forming part of Letters Patent No. 38,135, dated April 7, 1863.

To aZZ whom t may concern:

Beit known that we, DAVID SEATTUGK, of Cambridge, in the county of Middlesex, and State of Massachusetts, and J. S. SHATTUCK, of Malden, in the county and State aforesaid, have invented certain Improvements in Machines for Cutting Rasps, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a plan of a rasp-cutting machine with our improvements attached 5 Fig. 2, a side elevation, the gear E being removed to expose the parts behind it 5 Fig. 3, a front elevation of the same, Fig. 4, a view of the cams H4 and bar H5.

The machine represented in these drawings is designed for cutting blacksmiths7 rasps, the teeth of which are disposed in rows across from side to side of the ile. The driving-shaft A runs in standards B, rising from a table or bench, C, which is carried by a post, D. The blank a is secured to a suitable holder, b, and is fed up by a constant movement as the cutting proceeds in the following manner: A gear, E, upon the driving-shaft engages with an intermediate gear,E2,upon a short shaft,E5, which also carries a bevel-wheel, E4, which drives a corresponding gear,E5,upon a vertical shat't, E6. A spur-wheel, E7, at the foot of this shaft, through the intermediatewheels,Ea and E9, drives a wheel,E10, in the center of which is a female screw,:through which passes the screw-rod E11, to the upper end of which is ati tached the holder, which carries the iile, and

thus, as the main shaft revolves, the file-blank is fed up past the cutter. The le-blank is supported by a rest, F, projecting from the top of the post D2. The cams G, which operate the chisel or cutter, are carried by the drivingshaft A and operate upon an arm, G2, projecting from the cutter-shaft G5, from which projects the cutter-head G4. The cutter is thrown after being released from its cam G by the spring G5, (seen dotted in Fig. 2,) and the arm G2, as it descends, strikes against a spring, G5, by which the cutter is raised from oft the blank the instant it has made its cut. The cuttershaft G5 is pivoted to a carriage, G9, which is fed forward to carry the cutter across the blank to form the rows of teeth in the following manner: H is aworm upon the driving-shaft, which engages with a worm-gear, H2, upon a shaft running in the long box or bearing H3, upon the opposite end of which are the cams H4, against which rests a bar, H5, projecting from the cutter-carriage, and thus, as the main shaft revolves, the cams H4 feed the cutter across the blank. When the bar H5 escapes from one ofthe cams H4,the carriage is brought back ready to commence a new line of cuts by the spring I, which bears upon an arm, I2, projecting from the shaft I3, from which rises an arm, I4, (seen in broken lines in Fig. 3,) the end of which works in an opening or hole in the cutter-carriage, or is otherwise suitably connected thereto, so as to keep the bar H5 constantly pressed against the cams H4. These cams are seen enlarged in Fig. et. It has been stated that the teeth are placed inrows across the rasp, but it is essential that they be placed irregularly lengthwise of the rasp. It is for the purpose of effecting this irregular disposition of the teeth that we employ the cams H4. Were the carriage traversed across the blank by one and the same cam, the teeth would all be disposed one beneath the other through the whole length of the rasp, but by employing two or more cams of dii'erent shapes and height the teeth may be placed irregularly as required. The blank is kept down upon its rest by the presser f, the long arm f2 of which is forced up by the springfa. When the blank and its holder are to be removed from the machine, the presser is raised by forcing down its arm f2 beneath the catch f4. As the blank is fed up by a constant motion, if the cutter was fed in a plane perpendicular to its line of motion, it is obvious that the teeth would be disposed in rows inclined to the sides of the rasp. To obviate this the cutter-carriage is caused to move upon inclined ways H5. This improvement is the invention of A. B. Southwick and H. E. Grandy, and need not be further described. The same may be said of the method herein adopted for holding the cutter or chisel i, which is formed of a bar of three-cornered steel, which passes through a mortise in the cutter-head, in which it is confined by another bar, i5, in a mortise, ctt at right angles to the other and a screw, 1.

to secure by Letters Patent in a machinev for cutting rasps, isl- 1. Arranging the cutter upon a traversing carriage and moving `the same across the face of the rasp with a changing motion, for the purpose of placing the teeth in rows, as set forth.

2. In combination with the above, the cams H4, operatingas set forth, for the purpose described.

DAVID SHATTUCK. [Lgs] J. S. SHATTUGK. [1.. s.] Witnesses:

SAM. COOPER, l?. E. TESGHEMACHER. 

